#include <iostream>


int main(){
    int list_depth[4];
    for(int &depth : list_depth){
        std::cin >> depth;
    }
    int rising = 0;
    for(int i = 0; i < 3; ++i){
        if(list_depth[i] > list_depth[i + 1]){
            if(rising == 1) {
                std::cout << "No Fish";
                return 0;
            }
            rising = -1;
        }else if(list_depth[i] < list_depth[i + 1]){
            if(rising == -1){
                std::cout << "No Fish";
                return 0;
            }
            rising = 1;
        }
    }
    if(rising == 1) std::cout << "Fish Rising";
    else if(rising == -1) std::cout << "Fish Diving";
    else std::cout << "Fish At Constant Depth";
    return 0;
}